Casing clamp for oil wells



T. E. ROBINSON.

CASING CLAMP FOR OIL WELLS.

APPLICATION FILEUFEB, 28x 1921.

Patent-ed Jan. 3, 1922 Thomas E. Hob 177.50%.

Unirse STATES' earner-"aerien THOMAS E. ROBINSON, OF TULSA,$OKLAHOMACASINGCLALYIP FOB OIL WELLS.

ASpfacilitation of Letters Patent. l Pafitgd Jan', 3, 1922,

VApplication filed February 28,1921. Serial No.744822.. VjV

j To @ZZ whom it may cof/weint:

B Be it known that l. TnoMas E. l-oisrnsoi, citizen of the UnitedStates, residing at Tulsa, in the county of Tulsa and State of Oklahoma,have invented certain new and useful Improvements in a Casing Clamp forOil ldlellaof which the followingis a specifu cation. l

My invention relates to oil well drilling. appliances, and particularlyto a clamp for holding and setting a well casing. ln oils well drilling,the method in use at the present time, comprises drilling a large bore,or

approximately ten inch diameter at the surface, a suiiicient depth toreach the bed of shale or stone. Then this has been accomplished acasing approximating eight and a quarter inches in diameter, is setwithin the bore to rest at lthe bottom on the shale bed. The casingconsistsv of joints of pipe averaging twenty two feet in length and itisnecessary that this casing be cut to the en act length required. Yapparatus for cutting the casing, and'thread- 3 ing the upper section,is not available at the well and considerable Avdelay is caused whilethe casing is being measured, cut and threaded to engage the flangeA atthe well surface.

D After the casing has been cut and positioned it frequently becomesnecessary to drill the original bore farther below the casing. Thisnecessitates raising the casing and passing a reamer therethrough, which5 expands below the bottom of the casing to the diameter ofthe originalbore. This process is Vcalled underreaming. Owing to the length of thecasing sections the lower end of the casing must be raised aconsiderable distance and as the earth at this point is generally loose,it often happens that it caves in upon the underreamer, hindering, andoften preventing operation thereof. When the casing is finally reset `anew upper section must be cut and threaded.

The primary object of my invention is to provide a casing clamp arrangedat the Well surface, which will eliminate the necessity of cutting andthreading the upper section of 0 the casing and which eliminates `thewaste of time, labor and material due to the method heretofore employed.

A further object is the provision of a simple and eiicient clamp of thecharacter 5 described, for permitting adjustment and underreaming of thecasing.

Generally the proper movable relation.

Another object is the provision of such clamp for accurate holding andsetting'of the casing. f

With these and other objects in view,

which will be apparent from the descrip-v tion, my invention resides inthe novel construction, combination, and arrangement of parts,hercinafter described and claimed, and illustrated in the accompanyingdrawings, of which: f i

1F ig. l, is a vertical section of. the upper end of anwell andcasingywith the clamp in position.

Fig. 2, a top plan View of the clamp, d.

Fig. 3, an elevation of an element of the Y clamp, I Fig. 4, afragmentary section on line 4.-,4 of Fig. 3, and

Fig. 5, a section on line 5-5of Fig. 3. -In the preferred form, Iprovide a `short supporting pipe section l of large diameter, which isdrivenin at the top ofthe well around the bore after same has beendrilled in the usual manner. The well casing2 is then lowered into thebore, in the usual manner, and held at any desired elevation by means ofclamping members Bicoacting with the outer Vsupporting` pipe vl andltheV casing 2, being disposed therebetweenas.

.shown in Fig. l,

IBelow the flange, the body of the plate lis considerably reduced inthickness forming a shoulder 6, and from this point the inner face ofthe plate inclines outwardly 4to the bottom, forming a wedge face.=Coacting with the plate 4 is an oppositely wedge shaped inner member inthe form of a generally similar plate 7, slidablyv secured on the plate4 by means of a detachable, dovetailed lug 8 disposed in a longitudinaldovesoA tailed slot 9 provided in the plate 4, where- Y by the membersare detachably secured in member 7 is provided with serrations 10 topermit of positive frictional gripping engagement with the casing 2.

The inner face of the d In opereeionrthe'pipe l and eesinghsiifing beenpositioned, the Clamps 3 ere in-V serted between eheoi y eend Gesine inradial speoeelV relation, ivl'ierenpon the serrated y feces ofthe'members l" will engegefbheeesving to rlgidly cle-mp in position owing;

tothe Wedgeiormetion .of the clamp pleitos.

(loWnWercl movemene thereof i'vill 'errested by'reeisonV oi? lie Wedgesuction oil' the 'ele-Untis.VK f A Y It will beV ipp-.irene thee withthis com struction', when le desiredY to onderlen-m y'the easing, it maybe lifted onlg.r e few inches thereby eliminating the probability olgheeerth'eesfing in upon thennclerreemeii le is `obvious thetrthe easingoenbe sesY ei; engr desired point, thereby eliminating' the ont tingy ofthe Lipper soot-ion, and the provision ing il-stationery tubularsupport, marquee/e Y VVofthe suplioifting' pipe does eweywih ythethi'eiding of:V the upper flange now v employed.

YWhile I have shownV and? described Cerf-V ijein materiels enel detailswhich enter into VtheConstructionand operetionjo my inveir Y tion, ldesire it to be understood that l (lo not. limitrmysel'f to these,;buttheir any such maybe used es will fell Within the Y,soopefoifV port, eWedge plete, means on seid plate adapted to engage seid-supportforsuspen` sion of thejpletetherein Vemile' casing en- ,gegingVnfeclg'fli plete. seid plees being permanently connected in slideblerelation.

Vln e eesing clamp lor oil Wells, a supportlng pipeseoeion5 1.wedgeplete adapted *fte be' insereefl therein, e lienge on seid plete,'zmlepteol to engage' `or'eien enel of seid ypipe seoeionjfor suspensionol' seid plete@Y Wedge plete adapted to engage@J VWell easing, and

l iieteehebly' eimnged, permanent connection between seid platesarranged for relative movemene of the'gpletes. n f y el. ln a eesingolempjjfor oil Wells, e suplporeing stationery pipe section, en eroue'elongitudinally wedge shaped Vplete suspencied lgl'i'erein, flange onseid plete aclepf eel to engage Vone enel of yseid pipe section, :i

member nelepteditoengage@ Well easing und slidebly disposedY on seidplete. and

Ineens for permanentattaching oonneeion between seid y'plate enelmember. Y Y

A. easing clamp `forroil Wells compris plete, e member on seid pleteadapted to engaige loosely over en end oi seid support to suspend seidplete therein, seielspl'ate haw-- a. longitudinel"doveteileclslot, e',wedge ineke, easing engaging means on oneV face thereof7` e logon 'theopposite'feoe thereof and `disposed in seid slot'or sllcleble permenentattachingyeonneotion between the plates, `Within seid support.

'1 6. A easing elempforoil Wells,foomprs ingepeir `of oppositelyjveflgeshaped abutting members, permanent attaching connectionV between seidmembers arranged )for shdeble relation of the members, seppero `ingmeans on one'o'f seid members,V and eesing;V engagingv Ineenskr on theother 'of sani Y members.

" "THOMAS E. ROBINSQNQ,

